CHEMICAL REACTION ENGINEERING QUIZ

An imbalanced chemical reaction equation is against the law of

Conservation of mass

None of these

Multiple proportion

Constant proportion

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Which of the following is the most suitable for very high pressure gas phase reaction?

Batch reactor

Tubular flow reactor

Stirred tank reactor

Fluidised bed reactor

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A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds.

1

32

3

43833

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Which of the following will give maximum gas conversion?

Semi-fluidised bed reactor

Fluidised bed reactor

Plug-flow catalytic reactor

Fixed bed reactor

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The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + Kr.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)

E + ΔHA

E + ΔHA - ΔHR

E

ΔHA + ΔHR

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In a reversible reaction, a catalyst increases the rate of forward reaction

To a greater extent than that of the backward reaction

And decreases that of the backward reaction

And the backward reaction equally

Only

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With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be

Data insufficient; can't be predicted

Higher in CSTR

Higher in P.F. reactor

Same in both the reactors

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With increase in initial concentration, the fractional conversion of a first order reaction in a given time

Decreases

Remains constant

Unpredictable

Increases

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A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

Decreases

Is at the highest allowable temperature throughout

Increases

First increases and then decreases

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For a heterogeneous catalytic reaction

The surface of the catalyst does not play an important role during reaction

A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

The catalyst does not form an intermediate complex with the reactant

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